what setting keeps your computer recognized as "registered" so you don't have to enter password or answers to security questions each time a website (like your bank) is opened?
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While it could vary from site to site, the most likely method of saving that data is a cookie. Other possibilities include information saved in local storage (DOM storage) or a Flash LSO (sometimes called a Flash cookie or supercookie).
Even when the site finds the locally saved data, it may require your username and password, but it usually would not persist with the additional questions.
Some sites may also link your cookies to your IP address. Usually your IP address is stable in any given location, but if you use a private VPN service or TOR to anonymize your connection, it may vary.
In case you are using "Clear history when Firefox closes":
- do not clear the Cookies
- do not clear the Site Preferences
- Tools > Options > Privacy > Firefox will: "Use custom settings for history": [X] "Clear history when Firefox closes" > Settings
Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, passwords, and other website specific data.
Clearing cookies will remove all specified (selected) cookies including cookies with an allow exception that you would like to keep.